From Wikipedia:

Francus

Francus is an invention of Merovingian scholars which referred to a legendary eponymous king of the Franks, a descendant of the Trojans, founder of the Merovingian dynasty and forefather of Charlemagne. In the Renaissance, Francus was generally considered to be another name for the Trojan Astyanax saved from the destruction of Troy. He is not considered to be historical, but in fact an attempt by medieval and Renaissance chroniclers to model the founding of... Read More